Graco 800N Instructions Manual page 13

Fluid Packing Replacement
1. If leakage occurs at the fluid needle packing nut
(9), tighten the nut. If leakage does not stop, re-
move the fluid adjustment knob (6), spring (7) and
needle (1). See Fig. 2.
2. Unscrew the packing nut (9) and remove the old
packings (10). A small hooked tool can be used to
remove packings from the cavity. Clean and in-
spect all the parts for wear or damage, replacing
parts as needed.
3. Lubricate the new packings with lightweight oil and
insert them into the cavity in the order shown in
Fig. 2, Detail D.
4. Install the needle (1), spring (7) and the fluid ad-
justment knob (6) into the gun body. Slide the
packing nut (9) onto the needle before inserting the
needle into the packing cavity.
Service
5. Turn the fluid adjustment knob (6) in until it bot-
toms out, then back it out six full turns for proper
spring adjustment.
6. With the trigger released, screw the packing nut (9)
in until the packing is fully compressed, then back
the nut off until the needle moves freely when the
gun is triggered.
NOTE: For the best fluid packing life, lubricate the gun
daily as explained in Maintenance.
Installing Fluid and Air Fittings
If the fluid fitting (20) is removed, be sure to install its
gasket and washer when reinstalling the fitting. Apply
Loctite 242 sealant or equivalent on the fluid fitting
threads and torque it into the gun body to 20 ft-lb
(27 N m).
If the air hose fitting (21) is removed, apply Loctite
PST pipe sealant or equivalent to its threads and screw
it into the gun body.
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